Illuminating-tile



(No Model.)

.6. JACOBS. ILLUMINATING TILE.

Patented DeG. 13, 1892-.-

UNITED STATES PATENT OFFICE.

JACOB JACOBS, OF BROOKLYN, NEWV YORK.

lLLUMlNATlNG-TILE.

SPECIFICATION forming part of Letters Patent No. 488,122, dated December13, 1892.

Application filed June 21, 1892- Serial No. 437,479. (No model.)

To all whom it may concern:

Be it known that I, JACOB JACOBS,a citizen of the United States,residing at Brooklyn, in the county of Kings, and inthe State of NewYork, have invented certain new and useful Improvements in Lenses forIlluminating- Tiles, Vault-Covers, &c.; and I do hereby declare that thefollowing is a full, clear, and

exact description thereof, reference being had to the accompanyingdrawings, in which Figure 1 shows a top plan view "of one of my lenses;Fig. 2,a vertical central section of vide an improved lens for use inilluminatingtiles, vault-covers, &c. and to this end it consists in thelens and the parts thereof constructed, arranged, and combined ashereinafter set forth.

In the drawings, A designates the body of the glass part of the lens,and A the base thereof, which, as in lenses heretofore made, isconstructed of greater diameter than said body and can be round. asshown in Fig. 1, square with corners cut off, as shown in Fig. 4, or ofany other desired shape.

The body A is provided with one or more spiral or inclined screw-threadsact to engage correspondingly-shaped thread or threads on the inner faceof the jacket 0, so that the latter can be screwed down upon said body.Such jacket is preferably made of sheet metal,which can bebrass,iron,tin, copper, aluminum, lead, galvanized iron, zinc, or othermetal; but it can, if desired, be formed instead of gutta-percha,celluloid, earthenware, or any other desired material. When it is madeof sheet metal or other thin substance, the desired thread or threads 0c on it can consist, as indicated in the drawings, of suitablecorrugations to correspond with the ribs and depressions on the body A.The upper edge of the jacket is preferably made to extend inward over aportion of the upper part of the lens-body in the manner indicated infull lines in Figs. 1, 2, 3, and 4, or it can be caused to stand uprightand simply embrace the cylindrical top of said body, as shown in dottedlines in Fig. 3.

In Figs. 1 and 2 the jacket has around its upper edge an abruptinwardly-turned lip c, which engages the bottom of an annular rabbet ain body A, which'is preferably deeper than the lip is thick, so that thetop of the lat-- ter forms no part of the walking-surface. The lower endof the jacket has an outwardly and downwardly extending flange or lip 0,extending over a correspondingly outwardly-inclined face a connectingthe outer face of body A with the projecting base A.

In the lens shown in full lines in Fig. 3 there is no rabbet a in thebody; but the upper edge of the latter is rounded or beveled off and theupper end of the jacket is inclined inward to embrace a portion of therounded or beveled part, but preferably stops short of the upper face ofthe glass. The top of the base A and the flange c on the jacket ex tendout substantially at a right angle to body A. As the engaging threads onsaid body and jacket will securely hold the two from up or down movementwith reference to each other and the lower end of the jacket engagingthe base A effectually limits the downward screwing of the jacket, theinturned lip at the upper end of the latter can be dispensed with, ifdesired, and the jacket can be above its thread, carried up verticallyso as to inclose a cylindrical part of the lens, in the manner indicatedin dotted lines in Fig. 3.

Instead of having the outturned flange at the lower end of the jacket, Icontemplate, where it is desired, providing the base with an annulardepression a in its top, into which the jacket will project when screweddown into place around the body A. (See Fig.

In order to make a close water-tight joint between the inner and outerfaces of the jacket and body, respectively, I have a thin layer 0 ofwhite or red lead, cement, or other waterproof material between suchfaces. This layer can be easily secured by coating the body A or jacket,or both of them, with the desired material before such'parts are screwedtogether.

Instead of threading all or nearly all of the lens body and jacket, thescrew thread or threads can be made to eitend over only a portionthereof, the rest being made plain.

By making my lens with its parts constructed and arranged as shown anddescribed I am enabled to use a jacket which can be made complete beforebeing applied to the glass body, and it needs no spinning or forcing inof anyof its parts to fast-en it securely to said body or make it holdthe latter most tightly and securely.

Where, as I prefer, the jacket is made of sheet metal corrugated toproduce the ribs and depressions necessary to engage the threads of thebody A, its outer side will afford the best and surest hold for thecement D, which is to be used in the ordinary way to secure the lens inthe tile-frame, part of which is shown at E in Fig. 2.Inwardly-projecting portions of the surrounding cement interlock withthe outwardlyprojecting parts of the jacket, so that the strongest holdand the most perfectly water-tight joint between the cement and jacketis secured. The inter locking threads on the inner face of the jacketand periphery of body A could also be made to fit or engage each otherso tightly that a good water-tight joint could be secured; but I preferto use the thin layer of white or red lead or cement, in order to makecertain that no moisture can get down around the glass, even if the fitof the jacket should not be absolutely perfect at all points.

Havingthus described my invention, what I claim is l. A lens forilluminating-tiles, vault-covers, 850., having the screw-threaded glassbody and a jacket separate from the plate or frame for supporting thelens and screwed upon the portion of the lens-body to be surrounded bythe holding-cement on the frame, substantially as and for the purposespecified.

2. A lens for illuminating-tiles, vault-covers, &e., having thescrew-threaded glass body,

a jacket screwed thereon, and a layer of waterproof material between thejacket and body filling the opposing threads on thejacket and body,substantially as and for the purers, &c., having the screw-threadedbody, a

projecting base, anda jacket screwed upon the body, provided with aprojecting lip or flange on its lower end, substantially as and for thepurpose described.

5. A lens for illuminating-tiles, vault-covers, &c., having thescrew-threaded body and the jacket screwed thereon having at its upperend a portion extending in over a portion of the body, substantiallyasand for the purpose specified.

6. A lens for illuininating'tiles, vault-covers, &c., having thescrew-threaded body pro-- vided witha rabbet around its upper end andthe jacket screwed upon such body, having the inturned lip to enter therabbet, substantially as and for the purpose shown.

7. A lens for illuminating-tiles, vault-covers, &c., havingthescrew-threaded glass body and the jacket around the latter corrugated toengage the threads on the body and leave projecting ribs and grooves onits outer side, substantially as and for the purpose set forth.

8. A lens for illuminating-tiles, vault-covers; 850., having thescrew-threaded body, the jacket of thin material corrugated to engagethe thread or threads on the body, and a coating or layer of waterproofmaterial between the opposing surfaces of jacket and body, substantiallyas and for the purpose described.

In testimony that I claim the foregoing I have hereunto set my hand this8th day of June, A. D. 1892.

JACOB JACOBS.

- Witnesses:

WARREN O. STONE, HENRY O. HAZARD.

